The day I had weaned to only night feeds and went back to work with #1, so 7 months. But then, I was only feeding once a day by then.

After about 3 months with #2 ... and I BF for 14 months with her.

I think it has to do with how much time they actually spent sucking. #1 took 45 minutes for a single feed, #2 took 10 minutes at her absolute slowest.